John jeffreys



UNITED vSTATES PATENT OFFICE,

JOHN JEFFRErs, or LONDON, A NGLAND.

F AN..

SPECIFICATION forming part of Letters Patent N o. 594.206, dated November 23, 1897. Application med' Much 11,1897. serialNo. 627,002. on, moar-,1.) Patented in England December' 13,1895,N0.23,921. l

ing and Ventilating' engineer, a subject of the Queen of Great Britain, residing at l1 Old ,Queen Street,Westminster,London,England,

have invented certain new and useful Improvements in Fans, (for which I have received Letters Patent in Great Britain, N o.

23,921, dated .December 13, 1895,) of .which the following is a specification.

.This invention relates to a fan for forcing or exhausting air. It is especially suitable for use as a Ventilating-fan. lVithin the case of the fan a number of spiral directing-blades are provided, surrOundingt-he lyor revolving blades. The air enters around the axis of the fly and is driven by the ly into the channels formed for it by the stationary spiral blades. It is directed by these to an annular outlet, whence it issues in a direction parallel to the axis of the fly. When the fan is intended to be actuated by an electromotor, this motor is madelan integral `pa'rt of the fan, the armature being mounted upon the axis at the outlet end and being contained in a chambery formed in thecover of the fan-casing. Within this 'chamber the stationary or Iield magnets are also contained. The commutatoris'mounted upon the axis of the fan on the inlet side of the ily. I

In the annexeddrawings, Figure 1 is a secltion parallel to the axis, Fig, 2 isa half-elevation on theinlet side, and Fig. '3 is-a halfcasing. carries the stationary spiral blades d.-

section on the line 43 3, Fig. 1, of a fan in ac- The part ahas a flange on it at ber into which the air is to be forced or from which it is to be drawn. This portion of the They pass partly around the interior of the nating at the outlet.

casing, commencing near the inlet and termi- The part b of the'casing is bolted to the parta, and in it is the inlet-'aperture b'. It also has arms b2, which support the 'bearing b3 of the fly-shaft. 'llhe part c of the casing-forms a cover to thev part a. It is connected to it by four or other number of arms, which are secured tothe interior of the part aby bolts or otherwise. In this cover at e is a bearing for the otherend of the y-shaft. The cover, as will be seen,

closes the central-portion of the part a of the casing, leaving only the annular ou tlet f for 5 the exit of the air.

g is the armature of the electromotor for driving the fan. It is fast upon the shaft h. .1

'i is the field-magnet fixed Within the casing and together with the armature contained in 6o a chamber provided in the cover c.

j is a diaphragm which incloses the chamber on the inner side.

7c is the commutator of the electrOmOt-Or. It also is fixed upon the fly-shaft, but on the inlet side thereof;

The ily consists of a boss Z, fixed upon the shaft h, and arms l on this boss carry blades h2, which are so formed as to leave an unobstructed inlet-chamber'around the shaft at m, 7o While their outer ends pass in close proximity to the inner edges of the stationary spiral directing-blades d.

'n n are strained-wire connections between the blades which serve to stien the y and support the blades the one from the other.

What I claim isf,

l. The combination of the ily-blades, the casing within which the blades are mounted to rotate, the annular series of spiral direct- 8o ing-blades Within the casing and surrounding the ily-blades, the central inlet for air on onel side of the casing and the annular outlet on the other side, the -arrangement being such that air entering ,at the inlet is driven by the fan-blades into the spiral directing-channels I and is conducted by these to the annular outlet where it issues in a direction parallel to the ily-shaft.

2.v The combination of the fly-blades, the 9o oasin g around the blades, the spiral directingblades, the central inlet and annular outlet,

a chamber within the end cover of the' casing on the outlet side, .and an armature of an electric motor fixed upon the fly-shaft Within said chamber.

3. The combination of the iiy-shaft, the iiyblade secured thereto, a casing having a central inlet, and an annular outlet, {1y-blades secured to the shaft and to the annular se- Ioo ries of directing-blades surrounding the flyblades and interposed betweenthem and the annular outlet.

" JOHN JEFFREYS. Witnesses;

ROBERT SEL'rH, RICHARD GEO. DUNN. 

